KTOR-8901 Remove AnnotationTarget.FUNCTION from @KtorDsl

[osipxd]

Subsystem
Core

Motivation
KTOR-8901 Remove AnnotationTarget.FUNCTION from @KtorDsl

Solution
This PR removes wrongly applied annotations and removes the annotation target FUNCTION.

I'd merge this into the next patch release, however this change might break code misusing the @KtorDsl annotation. The main point why I want it to be included is that this change prevents further misuse of the @KtorDsl annotation.

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✨ Finishing touches

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[bjhham]

I'd merge this into the next patch release, however this change might break code misusing the @KtorDsl annotation. The main point why I want it to be included is that this change prevents further misuse of the @KtorDsl annotation.

It sounds like you meant to select main for the base branch in this case...

[osipxd]

We could merge all changes except for removing the target into the patch release 🤔
And merge removing the target into the main.